Pumping apparatus for sprayers



April 10, 1956 A. w. RoLLlNs PUMPING APPARATUS FOR SPRAYERS Filed Nov. 8, 1954 PUMPKNG APPARATUS FR SPRAYERS Albert W. Rollins, Kansas City North, his.

Application November 8, 1954, Serial No. 467,405

1G Claims. (Cl. 299-97) This invention relates to improvements in pumping apparatus and more particularly to hand sprayers operable on the Well-known trombone principle and including, therefore, a plunger-cylinder assembly and associated valving for insuring pumping action on both strokes of the plunger with respect to the cylinder.

One of the most important objects of the present invention is to provide a sprayer pump of the aforementioned character with novel means for producing continued spraying action throughout the time the plunger and cylinder are reciprocated relatively, eliminating therefore, the loss of pressure normally occurring in conventional pumps of this type as the plunger stops at each end of its path or" travel for return movement.

Another o the most important objects of the present invention is to provide a trombone-type sprayer with a discharge tube upon which the spray nozzle is mounted, that is extensible not only for facilitating the use thereof in directing the spray to desired points, but to facilitate storage and packing.

A further important object of this invention is to provide in a trombone-type sprayer pump extensible features and accumulator' principles, all combined in a single device through novel arrangements of the respective parts and elements of each of these two features.

Other objects include the Way in which the sprayer pump is made up of three tubular members including the aforementioned cylinder and the discharge tube; the manner of subdividing a third of such members into a pair or interconnected tubular elements, i, e., the said plunger and a larger tube for receiving the accumulator and reciprocably mounting discharge tube; the manner of rendering the discharge tube retractable into the plunger tube; the way in which a single stop is provided tor limiting movement of the discharge tube, as Well as the cylinder with respect to the plunger; the manner of utilizing the discharge tube as a mounting means for he spring and the piston of the accumulator; and the in which the said discharge tube reciprocates with respect to the said piston.

in the drawing:

Figure l is a side elevational view of a pumping apparatus made pursuant to mypresent invention.

Fig. 2 is an enlarged, fragmentary, longitudinal, crosssectional View thereof.

Fig. 3 is a View similar to Fig. 2 but showing various parts at opposite ends of their paths of travel; and

Fig. 4 is a transverse, cross-sectional View taken on line lV-EV of Fig. 2.

The trombone-type sprayer pump shown in the drawing may be conveniently divided into rst, second and third tubular members 16, 12 and 14 respectively, the member 12 being further subdivided into a pair of tubular elements 16 and 1S.

The member 16 constitutes the cylinder of the pump and receives the element or plunger 16 that is telescoped into one end of the cylinder 1b for longitudinal reciprocation with respect thereto. The outside diameter of the plunger 16 is less than the inside diameter of the cylinder 10, presenting a space 20 surrounding the plunger 16.

A fitting 22 held within the innermost end of the plunger 16 by cross pin 24, is provided with a lluid inlet 26 and has a free floating O-ring 2S in surrounding relationship thereto and engaging the inner Walls of the cylinder 1d. A ball valve 30 is adapted to seat in closing relationship to the inlet 26 and is retained within the fitting 22 by the cross pin 24. Another cross pin 32 through the plunger tube 16 limits the extent of relative reciprocable movement of the cylinder 10 and the plunger 16 and also limits the extent of retraction of the discharge tube 14 into the plunger 16.

The base end of the cylinder 10 has a plug 34 releasably mounted therein and provided with an inlet port 35 that is in turn closed by check value 38 operating alternately with the check valve 30 during pumping.

lt is contemplated that the various tubes be made from lightweight material such as aluminum and, there fore, in order to provide a water-tight fit, plug 34 is provided with a V shaped, annular groove for seating a gasket 46. Gasket 40 Will not explode out of the groove or become damaged when plug 34 is drawn tight; in fact, plug 34 may be merely manipulated by hand. Plug 34 is adapted ,to receive one end ot a tube i2 leading to a supply of uid not shown.

A cap i4 perforated to clear the plunger 16 is mounted on the opposite end of the cylinder 1t? and houses a gasket or other sealing means 46 together with a ring t8 wedged into the proximal end of the cylinder 10.

The diameter of tubular element 1S is appreciably larger than that of the tubes 14 and 16, presenting therefore, a chamber 5U surrounding the tube 14. The innermost end of closure plug 52 of the tube 18 is threaded to receive the proximal outermost end of the plunger 16, and a bumper 54, teiescoped on plunger 16, limits the extent of movement of the cylinder 1% on the plunger 16 toward plug 52.

The opposite end of the tube 1S has a perforated plug S6 held therein by a special spring clip 53 and receives the tube 1e for reciprocable movement along the longitudinal axes of the tubes i6 and i3.

The clip 58 is provided With a semicircular retainer 6i) that normally embraces the tube 13 and frictionally'f grips the same. The plug 56 may be released by springing the clip 58 so as to remove inturned ears 62 that extend through the tube 1S and into the plug 56. When the embracing retainer et is swung away from the tube 1S, the clip 53 may be used as a means to hang the pumping apparatus on a suitable support.

A piston Within the chamber t) of tube 1S, inclu-c5 a ring 64, a resilient gland or cup 66, and a retainer 68, all circumscribing the discharge tube 1&3 for free movement with respect thereto. A spring 7l) coiled about the discharge tube 14 Within the chamber 5l) is interposed between the ring 64 and the plug 56 and yieldably biases the piston toward the plug 52 of tube 1S. Opposed, spaced stops or dimples 72 on the innermost end of the discharge tube 14 limit the extent of outward movement ofy the tube 14 and assure that the piston, as Well asV the spring 7l), are always retained upon the discharge' tube 14.

A suitable spray nozzle 74V mounted on the outermost end of the discharge tube 14' and the Yplunger 16, is provided with one or more openings 76 that places the same in communication with the space 20 therearound.

1n operation, the user normally grasps the tube 18 with one hand and the cylinder 10 with the other hand to reciprocate the plunger 16 relative to the cylinder 10. As cylinder 10 is vmoved to the position shown in Fig. 3 of the drawing, liquid will ow through the suction hose 42 and into the cylinder 10, past the valve 38. When the liquid in cylinder 10 is forced into plunger 16 past valve lii), and the liquid within the plunger 16 is forced through the discharge tube 14 and nozzle 74, as well 'as into space 20 through openings 76. Upon the next stroke the liquid within the space 2i) is forced into plunger 16 by way of the openings 76, and as the valve 30 closes the opening 26 liquid is forced out of tube 14.

Each time the liquid is forced from the plunger i6 into the discharge tube 14, such liquid will likewise become stored within the chamber 553 behind piston 66 by Virtue of the restrictionpresented by nozzle 74. Such storing of liquid within the chamber 50 is resisted by the springloaded piston 66 and as the plunger ldreaches the two ends of its path of travel, the pressurized liquid built up within the tube 18 and plunger 16 discharges through the tube 1.4, providing a continuous spray.

This cycle of operation is the same regardless of the position of the adjustable, combination discharge tube and accumulator support 14, and it is manifest that the latter may be adjusted throughout its length between stop 32 and its fully extended position. 'Ihe reciprocable movement of the plunger 16 is uneifected by the particui lar position chosen for the discharge tube 14 since pressurized duid will store within the chamber 50 against the action of spring 70 on each stroke'of the plunger 16 with respect to the cylinder 10.

Another feature of great importance is the fact that the apparatus of the instant invention need not be pumped as fast as conventional sprayers of its type. Whereas, it is quite common to pump 18 to 20 strokes per minute, the above-described sprayer Will operate satisfactorily with a lesser number of strokes. Still further, when nozzle 74 is adjusted to spray a mist instead of a steady stream, the 'operator may pump two or three strokes and then stop for as long as l to 20 seconds while the mist con- `tinues to spray from the nozzle 74. It is unnecessary to pump continuously as in the case of conventional equipment.

Having thus described the invention what is claimed as new and desired to be secured by Letters Patent is:

i. in a sprayer, a first tubular member; a second tubular member telescoped within the first member and reciprocable relative thereto; a third tubular member telescoped Within the second member and reciprocable relative thereto; means operable upon reciprocation of said first andvsecond members relatively for ejecting fluid through said third member; and a cross element in the second member for limiting the extent of outward movement thereof with respect to the rst member and for limiting the extent of movement of the third member into the second member.

2. In a sprayer, a first tubular member; a second tubular member having a rst tubular element telescoped Within the first member and reciprocable relative thereto; and a second tubular element secured to the first element in communication therewith; arthird tubular member communicating withrsaid first element; and means operable upon reciprocation of said rst member and said first element relatively for ejecting uid through said third member, said second element having a chamber for storing fluid emanating from the first element.

3. In a sprayer, a first tubular member; a second tubular member having a first tubular element telescoped Within the first member and reciprocable relative thereto, and a second tubular element secured to the first element in communication therewith; a third tubular member telescoped within the second element and reciprocable relative thereto; and means operable upon reciprocation of said first member and said first element relatively for ejecting uid through said third member, said second element having a lchamber for storing fluid emanatingY from the first eled ment, said third member being in axial alignmentY with said first element for retraction thercinto.

4. In a sprayer, a first tubular member; a second tubular ymember having a rst tubular ele ent telescoped within the iirst member and reciprocable relative thereto, and a second tubular element secured to the first element in communication therewith; a third tubular member communicating with said first element; and means operable upon reciprocation of said rst member and said first element relatively for ejecting duid through said third member, said second element having a chamber for storing iiuid emanating from the rst element and a spring-loaded piston f r yieldably resisting the storage of fluid in said chamber thereof.

5. In a sprayer, a first tubular member; a second tubular member having a iirst tubular element telescoped Within the rst member and reciprocable relative thereto, and a second tubular element secured to the first element in communication therewith; a third tubular member communicating with said rst element; means operable upon reciprocation of said rst member through said third member, said second element having a chamber for storing iiuid emanating from the rst element; and a springloaded piston reciprocable on said third member within the second element for yieldably resisting the storage of fluid in said chamber.

6. In a sprayer, a rst tubular member; a second tubular member having a rst tubular element telescoped 'within the first member and reciprocable relative thereto, and a second tubular element secured to the rst element in communication therewith; a third tubular member telescoped Within the second element and reciprocable relative thereto; means operable upon re- 4second element for yieldablyV resisting the storage of uid in said chamber.

7. In a sprayer, a rst tubular member; a second tubular member having a first tubular element telescoped within the first member and reciprocable relative thereto, and a second tubular element secured to the rst element in communication therewith; a third tubular member telescoped Within the second element and reciprocable relative thereto; means operable upon reciprocation of said first member and said rst element relatively for ejecting uid through said third member, said second element having a chamber for `storing uid emanating from the first element, said third member being in axial alignment with said first element for retraction thereinto; and a spring-loaded piston reciprocable on said third member Within the second element for yieldably resisting the storage of uid in said chamber.

8. In a sprayer, a first tubular member; a second tubular member having a first tubular element telescoped within the rst member and reciprocable relative thereto, and a second tubular element'secured to the first element in communication therewith; a third tubular member telescoped within thesecond element and reciprocable relative thereto; means operable upon reciprocation of said first member and said first element relatively for ejecting uid through said third member, said second element having a chamber for storing fluid emanating from the rst element, said third member being in axial alignment with said first element for retraction thereinto; a piston within the chamber and reciprocably mounted on the third member; and a spring coiled about the third member Within the chamber and engaging the piston whereby the latter yieldably resists the storage of uid in the chamber.

9. In a sprayer, a rst tubular member; a second tubular member having a first tubular element telescoped within the first member and reciprocable relative thereto, and a second tubular element secured to the first element in communication therewith; a third tubular member telescoped within the second element and reciprocable relative thereto; means operable upon reciprocation of said first member and said first element relatively for ejecting Huid through said third member, said second element having a chamber for storing uid emanating from the rst element, said third member being in axial alignment with said rst element for retraction thereinto; a piston Within the chamber and reciprocably mounted on the third member; a spring coiled about the third member Within the chamber and engaging the piston whereby the latter yieldably resists the storage of uid in the chamber; and stop means on the third member engageable with the piston for limiting the extent of out- Ward movement of the third member with respect to the second element.

10. In a sprayer, a rst tubular member; a second tubular member having a rst tubular element telescoped into one end of the first member for reciprocable movement relative thereto along the axes of the first member and the rst element, and a second tubular element having one end thereof secured to the outermost end of the iirst element in communication and axial alignment therewith, the diameter of the second element being greater than the diameter of the rst e1e ment; a third tubular member telescoped into the opposite end of the second element for reciprocation into and out of the iirst element; a piston reciprocable within the second element on the third member; and a spring coiled on the third member Within the second element between the piston and said opposite end of the second element.

References Cited in the le of this patent UNITED STATES PATENTS 575,498 Wright Jan. 19, 1897 1,943,034 Myers Jan. 9, 1934 2,348,190 Bullock May 9, 1944 20 2,557,247 Ziherl June 19, 1951 

